● 3-mode adjustable Brightness: high, low, and strobe● Suitable for camping, climbing, cycling, etc.● Power source: 1 x 18650 battery ( Not included ), batteries is not useful● Adopts 1 pieces of CREE R5 LED, output bright can achieve to to be 500 lumen● The body of flashlight is built of aircraft-grade aluminum alloy, has a very solid construction● Adopting internal wiring high efficient booster circuit,can utilize batteries in the largest extent